From a 1 or 2 liter clear plastic soda bottle (right) cut off the top, 1" below where it becomes straight. Cut slit 1" long into the side of the top (dotted line) to make it easy to insert into the bottle bottom. A 12 oz. aluminum can with a dark lable or coat the can with carbon black from a candle or wood fire. Put the can filled with water into the plastic bottle bottom and insert bottle top and press down to lock can in place. Caution: Water is very hot do not drink from bottle until cool. To pasteurize, water must be heated to 65 °C (149 °F). © Eric Marlow 2012 All rights reserved